/*
 * Anything: A flexible and easy to use data structure that combines the 
 * characteristics of a list and a hashmap into one data structure.
 * 
 * Based on a paper by Peter Sommerlad and Marcel Rueedi on 
 * 'Do-it-yourself reflection' entered at EuroPLOP 1998.
 * 
 * This library was written completely from scratch and is based only 
 * in spirit on the original Java Anything implementation written by 
 * Andre Weinand/Marcel Rueedi in 1997/99 and enhanced by Stefan Tramm 
 * in 2006.
 * 
 * Copyright (c) 2008 Thomas Marti and others. All rights reserved.
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * 
 *   http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package any.impl;


import java.math.BigDecimal;
import java.text.ParseException;
import java.util.Calendar;
import java.util.Date;

import any.Any;

//TODO: Defensives clonen dokumentieren!
final class DateAnything extends SimpleTypeAnything<Date> {

	private static final long serialVersionUID = 1;

	DateAnything(Date contents) {
		super((Date)contents.clone());
	}
	
	DateAnything(Calendar contents) {
		super(contents.getTime());
	}

	public Any toAny() {
		return new DateAnything(contents);
	}
	
	public Date asDate(Date defaultValue) {
		return (Date)contents.clone();
	}

	@Override
	@SuppressWarnings("unchecked")
	public Object toObject() {
		return contents.clone();
	}
	
	public Boolean asBool(Boolean defaultValue) {
		return defaultValue;
	}
	
	@Override
	public BigDecimal asBigDecimalImpl() {
		return new BigDecimal(contents.getTime());
	}
	
	@Override
	public Double asDoubleImpl(Number defaultValue) {
		return new Double(contents.getTime());
	}
	
	@Override
	public String asString(String defaultValue) {
		return formatDate(contents);
	}

	@Override
	public String toFullString() {
		return "Date\"" + formatDate(contents) + "\"";
	}

	// Helpers
	/**
	 * Formats the given date in the shortest way possible without losing any
	 * information.
	 * 
	 * @param date <tt>Date</tt> instance to be formatted.
	 * @return The formatted date.
	 * @throws NullPointerException if parameter <tt>date</tt> is <tt>null</tt>.
	 */
	private static String formatDate(Date date) throws NullPointerException {
		String dateStr = null;
		for (int i = 0; i < ANY_DATE_FORMATS.length; i++) {
			String tmpDateStr = ANY_DATE_FORMATS[i].format(date);
			try {
				if (!ANY_DATE_FORMATS[i].parse(tmpDateStr).equals(date)) {
					break;
				}
				dateStr = tmpDateStr;
			} catch (ParseException e) {
				// Should not happen
				throw new AssertionError(e);
			}
		}
		
		return dateStr;
	}
	
}
